[deliverable/linux.git] / arch / powerpc / sysdev / axonram.c

/*
 * (C) Copyright IBM Deutschland Entwicklung GmbH 2006
 *
 * Author: Maxim Shchetynin <maxim@de.ibm.com>
 *
 * Axon DDR2 device driver.
 * It registers one block device per Axon's DDR2 memory bank found on a system.
 * Block devices are called axonram?, their major and minor numbers are
 * available in /proc/devices, /proc/partitions or in /sys/block/axonram?/dev.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <linux/bio.h>
#include <linux/blkdev.h>
#include <linux/device.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/genhd.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/ioport.h>
#include <linux/irq.h>
#include <linux/irqreturn.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/types.h>
#include <linux/of_device.h>
#include <linux/of_platform.h>

#include <asm/page.h>
#include <asm/prom.h>

#define AXON_RAM_MODULE_NAME		"axonram"
#define AXON_RAM_DEVICE_NAME		"axonram"
#define AXON_RAM_MINORS_PER_DISK	16
#define AXON_RAM_BLOCK_SHIFT		PAGE_SHIFT
#define AXON_RAM_BLOCK_SIZE		1 << AXON_RAM_BLOCK_SHIFT
#define AXON_RAM_SECTOR_SHIFT		9
#define AXON_RAM_SECTOR_SIZE		1 << AXON_RAM_SECTOR_SHIFT
#define AXON_RAM_IRQ_FLAGS		IRQF_SHARED | IRQF_TRIGGER_RISING

static int azfs_major, azfs_minor;

struct axon_ram_bank {
	struct platform_device	*device;
	struct gendisk		*disk;
	unsigned int		irq_id;
	unsigned long		ph_addr;
	unsigned long		io_addr;
	unsigned long		size;
	unsigned long		ecc_counter;
};

static ssize_t
axon_ram_sysfs_ecc(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct platform_device *device = to_platform_device(dev);
	struct axon_ram_bank *bank = device->dev.platform_data;

	BUG_ON(!bank);

	return sprintf(buf, "%ld\n", bank->ecc_counter);
}

static DEVICE_ATTR(ecc, S_IRUGO, axon_ram_sysfs_ecc, NULL);

/**
 * axon_ram_irq_handler - interrupt handler for Axon RAM ECC
 * @irq: interrupt ID
 * @dev: pointer to of_device
 */
static irqreturn_t
axon_ram_irq_handler(int irq, void *dev)
{
	struct platform_device *device = dev;
	struct axon_ram_bank *bank = device->dev.platform_data;

	BUG_ON(!bank);

	dev_err(&device->dev, "Correctable memory error occurred\n");
	bank->ecc_counter++;
	return IRQ_HANDLED;
}

/**
 * axon_ram_make_request - make_request() method for block device
 * @queue, @bio: see blk_queue_make_request()
 */
static void
axon_ram_make_request(struct request_queue *queue, struct bio *bio)
{
	struct axon_ram_bank *bank = bio->bi_bdev->bd_disk->private_data;
	unsigned long phys_mem, phys_end;
	void *user_mem;
	struct bio_vec *vec;
	unsigned int transfered;
	unsigned short idx;

	phys_mem = bank->io_addr + (bio->bi_iter.bi_sector <<
				    AXON_RAM_SECTOR_SHIFT);
	phys_end = bank->io_addr + bank->size;
	transfered = 0;
	bio_for_each_segment(vec, bio, idx) {
		if (unlikely(phys_mem + vec->bv_len > phys_end)) {
			bio_io_error(bio);
			return;
		}

		user_mem = page_address(vec->bv_page) + vec->bv_offset;
		if (bio_data_dir(bio) == READ)
			memcpy(user_mem, (void *) phys_mem, vec->bv_len);
		else
			memcpy((void *) phys_mem, user_mem, vec->bv_len);

		phys_mem += vec->bv_len;
		transfered += vec->bv_len;
	}
	bio_endio(bio, 0);
}

/**
 * axon_ram_direct_access - direct_access() method for block device
 * @device, @sector, @data: see block_device_operations method
 */
static int
axon_ram_direct_access(struct block_device *device, sector_t sector,
		       void **kaddr, unsigned long *pfn)
{
	struct axon_ram_bank *bank = device->bd_disk->private_data;
	loff_t offset;

	offset = sector;
	if (device->bd_part != NULL)
		offset += device->bd_part->start_sect;
	offset <<= AXON_RAM_SECTOR_SHIFT;
	if (offset >= bank->size) {
		dev_err(&bank->device->dev, "Access outside of address space\n");
		return -ERANGE;
	}

	*kaddr = (void *)(bank->ph_addr + offset);
	*pfn = virt_to_phys(kaddr) >> PAGE_SHIFT;

	return 0;
}

static const struct block_device_operations axon_ram_devops = {
	.owner		= THIS_MODULE,
	.direct_access	= axon_ram_direct_access
};

/**
 * axon_ram_probe - probe() method for platform driver
 * @device: see platform_driver method
 */
static int axon_ram_probe(struct platform_device *device)
{
	static int axon_ram_bank_id = -1;
	struct axon_ram_bank *bank;
	struct resource resource;
	int rc = 0;

	axon_ram_bank_id++;

	dev_info(&device->dev, "Found memory controller on %s\n",
			device->dev.of_node->full_name);

	bank = kzalloc(sizeof(struct axon_ram_bank), GFP_KERNEL);
	if (bank == NULL) {
		dev_err(&device->dev, "Out of memory\n");
		rc = -ENOMEM;
		goto failed;
	}

	device->dev.platform_data = bank;

	bank->device = device;

	if (of_address_to_resource(device->dev.of_node, 0, &resource) != 0) {
		dev_err(&device->dev, "Cannot access device tree\n");
		rc = -EFAULT;
		goto failed;
	}

	bank->size = resource_size(&resource);

	if (bank->size == 0) {
		dev_err(&device->dev, "No DDR2 memory found for %s%d\n",
				AXON_RAM_DEVICE_NAME, axon_ram_bank_id);
		rc = -ENODEV;
		goto failed;
	}

	dev_info(&device->dev, "Register DDR2 memory device %s%d with %luMB\n",
			AXON_RAM_DEVICE_NAME, axon_ram_bank_id, bank->size >> 20);

	bank->ph_addr = resource.start;
	bank->io_addr = (unsigned long) ioremap_prot(
			bank->ph_addr, bank->size, _PAGE_NO_CACHE);
	if (bank->io_addr == 0) {
		dev_err(&device->dev, "ioremap() failed\n");
		rc = -EFAULT;
		goto failed;
	}

	bank->disk = alloc_disk(AXON_RAM_MINORS_PER_DISK);
	if (bank->disk == NULL) {
		dev_err(&device->dev, "Cannot register disk\n");
		rc = -EFAULT;
		goto failed;
	}

	bank->disk->major = azfs_major;
	bank->disk->first_minor = azfs_minor;
	bank->disk->fops = &axon_ram_devops;
	bank->disk->private_data = bank;
	bank->disk->driverfs_dev = &device->dev;

	sprintf(bank->disk->disk_name, "%s%d",
			AXON_RAM_DEVICE_NAME, axon_ram_bank_id);

	bank->disk->queue = blk_alloc_queue(GFP_KERNEL);
	if (bank->disk->queue == NULL) {
		dev_err(&device->dev, "Cannot register disk queue\n");
		rc = -EFAULT;
		goto failed;
	}

	set_capacity(bank->disk, bank->size >> AXON_RAM_SECTOR_SHIFT);
	blk_queue_make_request(bank->disk->queue, axon_ram_make_request);
	blk_queue_logical_block_size(bank->disk->queue, AXON_RAM_SECTOR_SIZE);
	add_disk(bank->disk);

	bank->irq_id = irq_of_parse_and_map(device->dev.of_node, 0);
	if (bank->irq_id == NO_IRQ) {
		dev_err(&device->dev, "Cannot access ECC interrupt ID\n");
		rc = -EFAULT;
		goto failed;
	}

	rc = request_irq(bank->irq_id, axon_ram_irq_handler,
			AXON_RAM_IRQ_FLAGS, bank->disk->disk_name, device);
	if (rc != 0) {
		dev_err(&device->dev, "Cannot register ECC interrupt handler\n");
		bank->irq_id = NO_IRQ;
		rc = -EFAULT;
		goto failed;
	}

	rc = device_create_file(&device->dev, &dev_attr_ecc);
	if (rc != 0) {
		dev_err(&device->dev, "Cannot create sysfs file\n");
		rc = -EFAULT;
		goto failed;
	}

	azfs_minor += bank->disk->minors;

	return 0;

failed:
	if (bank != NULL) {
		if (bank->irq_id != NO_IRQ)
			free_irq(bank->irq_id, device);
		if (bank->disk != NULL) {
			if (bank->disk->major > 0)
				unregister_blkdev(bank->disk->major,
						bank->disk->disk_name);
			del_gendisk(bank->disk);
		}
		device->dev.platform_data = NULL;
		if (bank->io_addr != 0)
			iounmap((void __iomem *) bank->io_addr);
		kfree(bank);
	}

	return rc;
}

/**
 * axon_ram_remove - remove() method for platform driver
 * @device: see of_platform_driver method
 */
static int
axon_ram_remove(struct platform_device *device)
{
	struct axon_ram_bank *bank = device->dev.platform_data;

	BUG_ON(!bank || !bank->disk);

	device_remove_file(&device->dev, &dev_attr_ecc);
	free_irq(bank->irq_id, device);
	del_gendisk(bank->disk);
	iounmap((void __iomem *) bank->io_addr);
	kfree(bank);

	return 0;
}

static struct of_device_id axon_ram_device_id[] = {
	{
		.type	= "dma-memory"
	},
	{}
};

static struct platform_driver axon_ram_driver = {
	.probe		= axon_ram_probe,
	.remove		= axon_ram_remove,
	.driver = {
		.name = AXON_RAM_MODULE_NAME,
		.owner = THIS_MODULE,
		.of_match_table = axon_ram_device_id,
	},
};

/**
 * axon_ram_init
 */
static int __init
axon_ram_init(void)
{
	azfs_major = register_blkdev(azfs_major, AXON_RAM_DEVICE_NAME);
	if (azfs_major < 0) {
		printk(KERN_ERR "%s cannot become block device major number\n",
				AXON_RAM_MODULE_NAME);
		return -EFAULT;
	}
	azfs_minor = 0;

	return platform_driver_register(&axon_ram_driver);
}

/**
 * axon_ram_exit
 */
static void __exit
axon_ram_exit(void)
{
	platform_driver_unregister(&axon_ram_driver);
	unregister_blkdev(azfs_major, AXON_RAM_DEVICE_NAME);
}

module_init(axon_ram_init);
module_exit(axon_ram_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Maxim Shchetynin <maxim@de.ibm.com>");
MODULE_DESCRIPTION("Axon DDR2 RAM device driver for IBM Cell BE");
Commit	Line	Data
dbdf04c4 MS	1	/*
	2	* (C) Copyright IBM Deutschland Entwicklung GmbH 2006
	3	*
	4	* Author: Maxim Shchetynin <maxim@de.ibm.com>
	5	*
	6	* Axon DDR2 device driver.
	7	* It registers one block device per Axon's DDR2 memory bank found on a system.
	8	* Block devices are called axonram?, their major and minor numbers are
	9	* available in /proc/devices, /proc/partitions or in /sys/block/axonram?/dev.
	10	*
	11	* This program is free software; you can redistribute it and/or modify
	12	* it under the terms of the GNU General Public License as published by
	13	* the Free Software Foundation; either version 2, or (at your option)
	14	* any later version.
	15	*
	16	* This program is distributed in the hope that it will be useful,
	17	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	18	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	19	* GNU General Public License for more details.
	20	*
	21	* You should have received a copy of the GNU General Public License
	22	* along with this program; if not, write to the Free Software
	23	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	24	*/
	25
	26	#include <linux/bio.h>
	27	#include <linux/blkdev.h>
dbdf04c4 MS	28	#include <linux/device.h>
	29	#include <linux/errno.h>
	30	#include <linux/fs.h>
	31	#include <linux/genhd.h>
	32	#include <linux/interrupt.h>
	33	#include <linux/io.h>
	34	#include <linux/ioport.h>
	35	#include <linux/irq.h>
	36	#include <linux/irqreturn.h>
	37	#include <linux/kernel.h>
	38	#include <linux/mm.h>
	39	#include <linux/mod_devicetable.h>
	40	#include <linux/module.h>
	41	#include <linux/slab.h>
	42	#include <linux/string.h>
	43	#include <linux/types.h>
eb8f2763 JL	44	#include <linux/of_device.h>
	45	#include <linux/of_platform.h>
	46
dbdf04c4 MS	47	#include <asm/page.h>
	48	#include <asm/prom.h>
	49
	50	#define AXON_RAM_MODULE_NAME "axonram"
	51	#define AXON_RAM_DEVICE_NAME "axonram"
	52	#define AXON_RAM_MINORS_PER_DISK 16
	53	#define AXON_RAM_BLOCK_SHIFT PAGE_SHIFT
	54	#define AXON_RAM_BLOCK_SIZE 1 << AXON_RAM_BLOCK_SHIFT
	55	#define AXON_RAM_SECTOR_SHIFT 9
	56	#define AXON_RAM_SECTOR_SIZE 1 << AXON_RAM_SECTOR_SHIFT
	57	#define AXON_RAM_IRQ_FLAGS IRQF_SHARED \| IRQF_TRIGGER_RISING
	58
9a23409b MS	59	static int azfs_major, azfs_minor;
9a23409b MS	60
dbdf04c4	61	struct axon_ram_bank {
a454dc50	62	struct platform_device *device;
dbdf04c4	63	struct gendisk *disk;
fedcd2c5	64	unsigned int irq_id;
dbdf04c4 MS	65	unsigned long ph_addr;
	66	unsigned long io_addr;
	67	unsigned long size;
	68	unsigned long ecc_counter;
	69	};
	70
	71	static ssize_t
	72	axon_ram_sysfs_ecc(struct device dev, struct device_attribute attr, char *buf)
	73	{
a454dc50	74	struct platform_device *device = to_platform_device(dev);
dbdf04c4 MS	75	struct axon_ram_bank *bank = device->dev.platform_data;
	76
	77	BUG_ON(!bank);
	78
	79	return sprintf(buf, "%ld\n", bank->ecc_counter);
	80	}
	81
	82	static DEVICE_ATTR(ecc, S_IRUGO, axon_ram_sysfs_ecc, NULL);
	83
	84	/**
	85	* axon_ram_irq_handler - interrupt handler for Axon RAM ECC
	86	* @irq: interrupt ID
	87	* @dev: pointer to of_device
	88	*/
	89	static irqreturn_t
	90	axon_ram_irq_handler(int irq, void *dev)
	91	{
a454dc50	92	struct platform_device *device = dev;
dbdf04c4 MS	93	struct axon_ram_bank *bank = device->dev.platform_data;
	94
	95	BUG_ON(!bank);
	96
25985edc	97	dev_err(&device->dev, "Correctable memory error occurred\n");
fedcd2c5 MS	98	bank->ecc_counter++;
fedcd2c5 MS	99	return IRQ_HANDLED;
dbdf04c4 MS	100	}
	101
	102	/**
	103	* axon_ram_make_request - make_request() method for block device
	104	* @queue, @bio: see blk_queue_make_request()
	105	*/
5a7bbad2	106	static void
dbdf04c4 MS	107	axon_ram_make_request(struct request_queue queue, struct bio bio)
	108	{
	109	struct axon_ram_bank *bank = bio->bi_bdev->bd_disk->private_data;
	110	unsigned long phys_mem, phys_end;
	111	void *user_mem;
	112	struct bio_vec *vec;
	113	unsigned int transfered;
	114	unsigned short idx;
dbdf04c4	115
4f024f37 KO	116	phys_mem = bank->io_addr + (bio->bi_iter.bi_sector <<
4f024f37 KO	117	AXON_RAM_SECTOR_SHIFT);
dbdf04c4 MS	118	phys_end = bank->io_addr + bank->size;
	119	transfered = 0;
	120	bio_for_each_segment(vec, bio, idx) {
	121	if (unlikely(phys_mem + vec->bv_len > phys_end)) {
d81fec0f	122	bio_io_error(bio);
5a7bbad2	123	return;
dbdf04c4 MS	124	}
	125
	126	user_mem = page_address(vec->bv_page) + vec->bv_offset;
	127	if (bio_data_dir(bio) == READ)
	128	memcpy(user_mem, (void *) phys_mem, vec->bv_len);
	129	else
	130	memcpy((void *) phys_mem, user_mem, vec->bv_len);
	131
	132	phys_mem += vec->bv_len;
	133	transfered += vec->bv_len;
	134	}
d81fec0f	135	bio_endio(bio, 0);
dbdf04c4 MS	136	}
	137
	138	/**
	139	* axon_ram_direct_access - direct_access() method for block device
	140	* @device, @sector, @data: see block_device_operations method
	141	*/
	142	static int
	143	axon_ram_direct_access(struct block_device *device, sector_t sector,
30afcb4b	144	void *kaddr, unsigned long pfn)
dbdf04c4 MS	145	{
	146	struct axon_ram_bank *bank = device->bd_disk->private_data;
	147	loff_t offset;
	148
8204cba7 MS	149	offset = sector;
	150	if (device->bd_part != NULL)
	151	offset += device->bd_part->start_sect;
	152	offset <<= AXON_RAM_SECTOR_SHIFT;
dbdf04c4 MS	153	if (offset >= bank->size) {
	154	dev_err(&bank->device->dev, "Access outside of address space\n");
	155	return -ERANGE;
	156	}
	157
30afcb4b JH	158	kaddr = (void )(bank->ph_addr + offset);
30afcb4b JH	159	*pfn = virt_to_phys(kaddr) >> PAGE_SHIFT;
dbdf04c4 MS	160
	161	return 0;
	162	}
	163
83d5cde4	164	static const struct block_device_operations axon_ram_devops = {
dbdf04c4 MS	165	.owner = THIS_MODULE,
	166	.direct_access = axon_ram_direct_access
	167	};
	168
	169	/**
	170	* axon_ram_probe - probe() method for platform driver
00006124	171	* @device: see platform_driver method
dbdf04c4	172	*/
00006124	173	static int axon_ram_probe(struct platform_device *device)
dbdf04c4 MS	174	{
	175	static int axon_ram_bank_id = -1;
	176	struct axon_ram_bank *bank;
	177	struct resource resource;
	178	int rc = 0;
	179
	180	axon_ram_bank_id++;
	181
	182	dev_info(&device->dev, "Found memory controller on %s\n",
61c7a080	183	device->dev.of_node->full_name);
dbdf04c4 MS	184
	185	bank = kzalloc(sizeof(struct axon_ram_bank), GFP_KERNEL);
	186	if (bank == NULL) {
	187	dev_err(&device->dev, "Out of memory\n");
	188	rc = -ENOMEM;
	189	goto failed;
	190	}
	191
	192	device->dev.platform_data = bank;
	193
	194	bank->device = device;
	195
61c7a080	196	if (of_address_to_resource(device->dev.of_node, 0, &resource) != 0) {
dbdf04c4 MS	197	dev_err(&device->dev, "Cannot access device tree\n");
	198	rc = -EFAULT;
	199	goto failed;
	200	}
	201
28f65c11	202	bank->size = resource_size(&resource);
dbdf04c4 MS	203
	204	if (bank->size == 0) {
	205	dev_err(&device->dev, "No DDR2 memory found for %s%d\n",
	206	AXON_RAM_DEVICE_NAME, axon_ram_bank_id);
	207	rc = -ENODEV;
	208	goto failed;
	209	}
	210
	211	dev_info(&device->dev, "Register DDR2 memory device %s%d with %luMB\n",
	212	AXON_RAM_DEVICE_NAME, axon_ram_bank_id, bank->size >> 20);
	213
	214	bank->ph_addr = resource.start;
40f1ce7f	215	bank->io_addr = (unsigned long) ioremap_prot(
dbdf04c4 MS	216	bank->ph_addr, bank->size, _PAGE_NO_CACHE);
	217	if (bank->io_addr == 0) {
	218	dev_err(&device->dev, "ioremap() failed\n");
	219	rc = -EFAULT;
	220	goto failed;
	221	}
	222
	223	bank->disk = alloc_disk(AXON_RAM_MINORS_PER_DISK);
	224	if (bank->disk == NULL) {
	225	dev_err(&device->dev, "Cannot register disk\n");
	226	rc = -EFAULT;
	227	goto failed;
	228	}
	229
9a23409b MS	230	bank->disk->major = azfs_major;
9a23409b MS	231	bank->disk->first_minor = azfs_minor;
dbdf04c4 MS	232	bank->disk->fops = &axon_ram_devops;
	233	bank->disk->private_data = bank;
	234	bank->disk->driverfs_dev = &device->dev;
	235
	236	sprintf(bank->disk->disk_name, "%s%d",
	237	AXON_RAM_DEVICE_NAME, axon_ram_bank_id);
dbdf04c4 MS	238
	239	bank->disk->queue = blk_alloc_queue(GFP_KERNEL);
	240	if (bank->disk->queue == NULL) {
	241	dev_err(&device->dev, "Cannot register disk queue\n");
	242	rc = -EFAULT;
	243	goto failed;
	244	}
	245
	246	set_capacity(bank->disk, bank->size >> AXON_RAM_SECTOR_SHIFT);
	247	blk_queue_make_request(bank->disk->queue, axon_ram_make_request);
e1defc4f	248	blk_queue_logical_block_size(bank->disk->queue, AXON_RAM_SECTOR_SIZE);
dbdf04c4 MS	249	add_disk(bank->disk);
dbdf04c4 MS	250
61c7a080	251	bank->irq_id = irq_of_parse_and_map(device->dev.of_node, 0);
fedcd2c5	252	if (bank->irq_id == NO_IRQ) {
dbdf04c4 MS	253	dev_err(&device->dev, "Cannot access ECC interrupt ID\n");
	254	rc = -EFAULT;
	255	goto failed;
	256	}
	257
fedcd2c5	258	rc = request_irq(bank->irq_id, axon_ram_irq_handler,
dbdf04c4 MS	259	AXON_RAM_IRQ_FLAGS, bank->disk->disk_name, device);
	260	if (rc != 0) {
	261	dev_err(&device->dev, "Cannot register ECC interrupt handler\n");
fedcd2c5	262	bank->irq_id = NO_IRQ;
dbdf04c4 MS	263	rc = -EFAULT;
	264	goto failed;
	265	}
	266
	267	rc = device_create_file(&device->dev, &dev_attr_ecc);
	268	if (rc != 0) {
	269	dev_err(&device->dev, "Cannot create sysfs file\n");
	270	rc = -EFAULT;
	271	goto failed;
	272	}
	273
9a23409b MS	274	azfs_minor += bank->disk->minors;
9a23409b MS	275
dbdf04c4 MS	276	return 0;
	277
	278	failed:
	279	if (bank != NULL) {
fedcd2c5 MS	280	if (bank->irq_id != NO_IRQ)
fedcd2c5 MS	281	free_irq(bank->irq_id, device);
dbdf04c4	282	if (bank->disk != NULL) {
dbdf04c4 MS	283	if (bank->disk->major > 0)
	284	unregister_blkdev(bank->disk->major,
	285	bank->disk->disk_name);
	286	del_gendisk(bank->disk);
	287	}
	288	device->dev.platform_data = NULL;
	289	if (bank->io_addr != 0)
	290	iounmap((void __iomem *) bank->io_addr);
	291	kfree(bank);
	292	}
	293
	294	return rc;
	295	}
	296
	297	/**
	298	* axon_ram_remove - remove() method for platform driver
	299	* @device: see of_platform_driver method
	300	*/
	301	static int
a454dc50	302	axon_ram_remove(struct platform_device *device)
dbdf04c4 MS	303	{
	304	struct axon_ram_bank *bank = device->dev.platform_data;
	305
	306	BUG_ON(!bank \|\| !bank->disk);
	307
	308	device_remove_file(&device->dev, &dev_attr_ecc);
fedcd2c5	309	free_irq(bank->irq_id, device);
dbdf04c4 MS	310	del_gendisk(bank->disk);
	311	iounmap((void __iomem *) bank->io_addr);
	312	kfree(bank);
	313
	314	return 0;
	315	}
	316
	317	static struct of_device_id axon_ram_device_id[] = {
	318	{
	319	.type = "dma-memory"
	320	},
	321	{}
	322	};
	323
00006124	324	static struct platform_driver axon_ram_driver = {
dbdf04c4	325	.probe = axon_ram_probe,
84dd4676	326	.remove = axon_ram_remove,
4018294b GL	327	.driver = {
	328	.name = AXON_RAM_MODULE_NAME,
	329	.owner = THIS_MODULE,
	330	.of_match_table = axon_ram_device_id,
84dd4676	331	},
dbdf04c4 MS	332	};
	333
	334	/**
	335	* axon_ram_init
	336	*/
	337	static int __init
	338	axon_ram_init(void)
	339	{
9a23409b MS	340	azfs_major = register_blkdev(azfs_major, AXON_RAM_DEVICE_NAME);
	341	if (azfs_major < 0) {
	342	printk(KERN_ERR "%s cannot become block device major number\n",
	343	AXON_RAM_MODULE_NAME);
	344	return -EFAULT;
	345	}
	346	azfs_minor = 0;
	347
00006124	348	return platform_driver_register(&axon_ram_driver);
dbdf04c4 MS	349	}
	350
	351	/**
	352	* axon_ram_exit
	353	*/
	354	static void __exit
	355	axon_ram_exit(void)
	356	{
00006124	357	platform_driver_unregister(&axon_ram_driver);
9a23409b	358	unregister_blkdev(azfs_major, AXON_RAM_DEVICE_NAME);
dbdf04c4 MS	359	}
	360
	361	module_init(axon_ram_init);
	362	module_exit(axon_ram_exit);
	363
	364	MODULE_LICENSE("GPL");
	365	MODULE_AUTHOR("Maxim Shchetynin <maxim@de.ibm.com>");
	366	MODULE_DESCRIPTION("Axon DDR2 RAM device driver for IBM Cell BE");